Additive Fabrication of Anepectic Meshes
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/56321 |
Resumo: | This work applies additive manufacturing technology to fabricate bi-dimensional lightweight composite anepectic meshes capable of demonstrating auxetic properties (negative Poisson’s ratio (NPR)) in combination with negative thermal expansion (NTE) behaviour, using as constituent materials polymers that do not exhibit NTE behaviour. Each mesh, obtained from varying either the material combination or the design parameter, was tested on a heated silicone bath to study the effects of the different combinations on the coefficient of thermal expansion (CTE). Photographs were taken at different stages during the heating process and were analysed to determine the CTE of each mesh. It was found that all composite meshes studied demonstrated a successful combination of NPR and NTE behaviours, and it was revealed that there is a possibility to tailor the meshes to activate the NTE behaviour within a chosen range of temperatures. For an extreme case, a Poisson’s ratio of −0.06, along with a CTE of −1568 10-6 (ºC-1) has been achieved. These meshes may be applied to structures and equipment in which the disparity in thermal stress has be carefully managed to extend the life of the device, and also to produce biomedical devices such as stents, surgical hernia meshes (SHM), compression garments and others, with many advantages over current designs, namely the ability to counteract any relaxation effects resulting from increases in the service temperature. |
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Additive Fabrication of Anepectic Meshes3-D printingAnepecticAuxeticNegative thermal expansionNegative Poisson’s ratioTuneable thermal expansionDomínio/Área Científica::Engenharia e Tecnologia::Engenharia dos MateriaisThis work applies additive manufacturing technology to fabricate bi-dimensional lightweight composite anepectic meshes capable of demonstrating auxetic properties (negative Poisson’s ratio (NPR)) in combination with negative thermal expansion (NTE) behaviour, using as constituent materials polymers that do not exhibit NTE behaviour. Each mesh, obtained from varying either the material combination or the design parameter, was tested on a heated silicone bath to study the effects of the different combinations on the coefficient of thermal expansion (CTE). Photographs were taken at different stages during the heating process and were analysed to determine the CTE of each mesh. It was found that all composite meshes studied demonstrated a successful combination of NPR and NTE behaviours, and it was revealed that there is a possibility to tailor the meshes to activate the NTE behaviour within a chosen range of temperatures. For an extreme case, a Poisson’s ratio of −0.06, along with a CTE of −1568 10-6 (ºC-1) has been achieved. These meshes may be applied to structures and equipment in which the disparity in thermal stress has be carefully managed to extend the life of the device, and also to produce biomedical devices such as stents, surgical hernia meshes (SHM), compression garments and others, with many advantages over current designs, namely the ability to counteract any relaxation effects resulting from increases in the service temperature.Velhinho, AlexandreBorges, JoãoRUNRaminhos, Joana Maria Santos2019-05-24T00:30:42Z2018-12-1320182018-12-13T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/56321TID:202467945enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:26:57Zoai:run.unl.pt:10362/56321Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:32:50.267109Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Additive Fabrication of Anepectic Meshes |
title |
Additive Fabrication of Anepectic Meshes |
spellingShingle |
Additive Fabrication of Anepectic Meshes Raminhos, Joana Maria Santos 3-D printing Anepectic Auxetic Negative thermal expansion Negative Poisson’s ratio Tuneable thermal expansion Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
title_short |
Additive Fabrication of Anepectic Meshes |
title_full |
Additive Fabrication of Anepectic Meshes |
title_fullStr |
Additive Fabrication of Anepectic Meshes |
title_full_unstemmed |
Additive Fabrication of Anepectic Meshes |
title_sort |
Additive Fabrication of Anepectic Meshes |
author |
Raminhos, Joana Maria Santos |
author_facet |
Raminhos, Joana Maria Santos |
author_role |
author |
dc.contributor.none.fl_str_mv |
Velhinho, Alexandre Borges, João RUN |
dc.contributor.author.fl_str_mv |
Raminhos, Joana Maria Santos |
dc.subject.por.fl_str_mv |
3-D printing Anepectic Auxetic Negative thermal expansion Negative Poisson’s ratio Tuneable thermal expansion Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
topic |
3-D printing Anepectic Auxetic Negative thermal expansion Negative Poisson’s ratio Tuneable thermal expansion Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
description |
This work applies additive manufacturing technology to fabricate bi-dimensional lightweight composite anepectic meshes capable of demonstrating auxetic properties (negative Poisson’s ratio (NPR)) in combination with negative thermal expansion (NTE) behaviour, using as constituent materials polymers that do not exhibit NTE behaviour. Each mesh, obtained from varying either the material combination or the design parameter, was tested on a heated silicone bath to study the effects of the different combinations on the coefficient of thermal expansion (CTE). Photographs were taken at different stages during the heating process and were analysed to determine the CTE of each mesh. It was found that all composite meshes studied demonstrated a successful combination of NPR and NTE behaviours, and it was revealed that there is a possibility to tailor the meshes to activate the NTE behaviour within a chosen range of temperatures. For an extreme case, a Poisson’s ratio of −0.06, along with a CTE of −1568 10-6 (ºC-1) has been achieved. These meshes may be applied to structures and equipment in which the disparity in thermal stress has be carefully managed to extend the life of the device, and also to produce biomedical devices such as stents, surgical hernia meshes (SHM), compression garments and others, with many advantages over current designs, namely the ability to counteract any relaxation effects resulting from increases in the service temperature. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-13 2018 2018-12-13T00:00:00Z 2019-05-24T00:30:42Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/56321 TID:202467945 |
url |
http://hdl.handle.net/10362/56321 |
identifier_str_mv |
TID:202467945 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799137950190010368 |